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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //1.创建xhr的对象
        var xhr = new XMLHttpRequest();
        //2.调用open函数
        xhr.open('POST', 'http://www.liulongbin.top:3006/api/addbook');
        //3.设置Content-Type属性
        xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        //4.调用send函数
        xhr.send('bookname=水浒传&author=施耐庵&publisher=上海');
        //5.监听onreadstatechange 事件
        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4 && xhr.status === 200) {
                // 获取服务器响应的数据
                console.log(xhr.responseText);
            }
        }
    </script>
</body>

</html>